std::get(std::tuple)

 

C++

Linguaggio

Concetti

Libreria di Utilità

Stringhe

Contenitori

Algoritmi

Iteratori

Libreria matematca

Input/output

Localizzazione

Espressioni regolari(C++11)

Operazioni atomicche(C++11)

Multithreading(C++11)

 

Utilità libreria

Tipo di supporto (basic types, RTTI, type traits)

Gestione della memoria dinamica

La gestione degli errori

Programma di utilità

Funzioni variadic

Data e ora

Funzione oggetti

initializer_list (C++11)

bitset

hash (C++11)

Gli operatori relazionali Original: Relational operators The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

rel_ops::operator!= rel_ops::operator> rel_ops::operator<= rel_ops::operator>=

Coppie e tuple Original: Pairs and tuples The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

pair

tuple (C++11)

piecewise_construct_t (C++11)

piecewise_construct (C++11)

Swap, in avanti e spostare Original: Swap, forward and move The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

swap

forward (C++11)

move (C++11)

move_if_noexcept (C++11)

declval (C++11)

 

std::tuple

Membri funzioni Original: Member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple::tuple

tuple::operator=

tuple::swap

Non membri funzioni Original: Non-member functions The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

make_tuple

tie

forward_as_tuple

None

operator= operator!= operator< operator<= operator> operator>=

std::swap

get

Helper classi Original: Helper classes The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

tuple_size

tuple_element

uses_allocator

ignore

 

template<std::size_t I, class... Types> typename std::tuple_element<I, tuple<Types...>>::type&     get( tuple<Types...>& t );	(1)	(dal C++11)
template<std::size_t I, class... Types> typename std::tuple_element<I, tuple<Types...>>::type&&     get( tuple<Types...>&& t );	(2)	(dal C++11)
template<std::size_t I, class... Types> typename std::tuple_element<I, tuple<Types...>>::typeconst&     get(const tuple<Types...>& t );	(3)	(dal C++11)

Estrae l'elemento Ith elemento della tupla. I è un valore intero in [0, sizeof...(Types)).

Original:

Extracts the Ith element element from the tuple. I is an integer value in [0, sizeof...(Types)).

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Parametri

t

-

tupla il cui contenuto da estrarre Original: tuple whose contents to extract The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions.

Valore di ritorno

1)

Riferimento all'elemento Ith di t.

Original:

Reference to the Ith element of t.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

2)

Rvalue riferimento all'elemento di Itht, a meno che l'elemento è di tipo lvalue riferimento, nel qual caso viene restituito lvalue riferimento.

Original:

Rvalue reference to the Ith element of t, unless the element is of lvalue reference type, in which case lvalue reference is returned.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

3)

Const riferimento all'elemento Ith di t.

Original:

Const reference to the Ith element of t.

The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Eccezioni

noexcept specification:  

noexcept

  (dal C++11)

Esempio

#include <iostream>#include <string>#include <tuple>   int main(){auto t =std::make_tuple(1, "Foo", 3.14);std::cout<<"("<< std::get<0>(t)<<", "<< std::get<1>(t)<<", "<< std::get<2>(t)<<")\n";}

Output:

(1, Foo, 3.14)

Vedi anche

std::get(std::array)	accesses an element of an array (funzione di modello)
std::get(std::pair) (C++11)	accede a un elemento di una pair Original: accesses an element of a pair The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (funzione di modello)